Always use the default pwhg_main executable. Drop unused link_madloop_libraries

Andrii Verbytskyirequested to merge
averbyts/athena:furthercleanup into main

Further PowhegControl cleanup.

  • Always use the default pwhg_main executable as since 07-09 all non-standard executables are renamed like that.
  • Drop unused link_madloop_libraries

@tpelzer @asaibel @katharin

Edited by Andrii Verbytskyi

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